I went to a Monster truck rally and pull years ago in the Edmonton Coliseum (home of the Edmonton Oilers).
There were some of the wildest trucks, 4 x 4's, even a jet truck!
The funniest thing was when the jet truck was pulling the sled it got about halfway before it dug in, but it was right below the scoreboard/sound system! The exhaust on the jet engine was pointed straight up, so guess what happened? It blew it all to pieces!
At the end of the night the audience wanted the tractor that was pulling the sled back to the start position after all of the pulls, to move around to the front of the sled to give it a go. As soon as the chain tightened up they swung the weight to the front of the sled to maximize the weight. That old girl never broke a sweat and just pulled it the whole distance like it was a regular day in the field.